Zoho not syncing with Google Calendar

We are using professional platform and are using google apps. Under ZOHO CRM for Google Apps I am not able to get the calendar to sync I have set up and enabled. The response is " Not yet executed the scheduler". In the notes above ZOHO says:

Synchronize with Google Calendar

You can schedule synchronization of events between Zoho CRM and Google Calendar. After synchronizing events, you can view and share the events with other users in Google Calendar. This feature is available only in the Paid Edition.

When you talk about "...available only in Paid Edition" is this the paid google apps or the paid zoho?

HELP